He was so touchy --- a word from her would him .
Every one of us must know:________we live can we save the earth.
—Can those________at the back of the classroom hear me? —No problem.
―Why? Where is my cellphone? ―Dear me! You _______ it in the taxi!
You need some facts _____ to base your theory.
________ for not keeping his promise,Gary hung his head in shame.